Measurement of the cross-section for electroweak production of dijets in association with a Z boson in pp collisions at √s=13 TeV with the ATLAS detector

Article history: Received 2 October 2017 Received in revised form 19 October 2017 Accepted 19 October 2017 Available online 27 October 2017 Editor: W.-D. Schlatter The cross-section for the production of two jets in association with a leptonically decaying Z boson (Z j j) is measured in proton–proton collisions at a centre-of-mass energy of 13 TeV, using data recorded with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 3.2 fb−1. The electroweak Z j j cross-section is extracted in a fiducial region chosen to enhance the electroweak contribution relative to the dominant Drell–Yan Z j j process, which is constrained using a data-driven approach. The measured fiducial electroweak cross-section is σ Zjj EW = 119 ± 16 (stat.) ± 20 (syst.)±2 (lumi.) fb for dijet invariant mass greater than 250 GeV, and 34.2 ±5.8 (stat.)±5.5 (syst.)± 0.7 (lumi.) fb for dijet invariant mass greater than 1 TeV. Standard Model predictions are in agreement with the measurements. The inclusive Z j j cross-section is also measured in six different fiducial regions with varying contributions from electroweak and Drell–Yan Z j j production. © 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.